Beater-roll for pulp-engines



' (No Model.)

J. HOYT.

BEATER ROLL FOR PULP ENGINES.

Patented Nov. 8, 1887.

FIG-II.-

N PEI'KRS. PhulwLithognphor. Washinglnm no.

UNITED STATES PATENT Orricn.

JOHN HOYT, OF MANCHESTER, NEW HAMPSHIRE.

'-BEATER-ROLL FOR PULP-ENGINES.

SPECIFICATION forming part of Letters Patent No. 372,978, dated November 8, 1887.

Application filed May 5,1887. Serial No. 237,203. (No model.)

To all whom it. may concern:

Be it known that I, JOHN HoYT, of Manchester, in the county of Hillsborough and State of New Hampshire, have invented a new and useful Improvement in Beater-Rolls for Pulp-Engines, which improvement is fully set forth in the following specification.

This invention relates to the construction of beater-rolls for pulpengines, or engines for beating rags or other stock into pulp for the manufacture of paper, and it has particular reference to the construction of the roll-bars and the mode of attaching the same to the roll. As usually constructed heretofore the roll has had a disk or circular plate at each end, and

the roll-bars rested at their-ends upon the edges ing this constructiomwhich it is the object of the present invention to overcome. In the first place the process of notching the ends of the bars and shrinking the hoop in place is tedious and expensive. The bars are only held at their ends, and are therefore liable to spring out of place in the middle, particularly as the wood filling between the bars swells when the roll is in use. Furthermore, the tongue or strip of metal which is clamped between the hoop and roll is very liable to break off, an accident that is of frequentoccurrence,and which, when it occurs, renders the entire roll useless.

According to the present invention the disks or plates upon whichthe bars rest have circular flanges near the edge cast in one piece with the plate, and the bars, which taper in crosssection from the bottom upward,rest upon the flange, and also upon the edge of the plate. Between the bars are placed wed ge-shaped keys of cast-iron,which are bolted to the flange and hold the bars in place. The ,bars are thus firmly attached to the roll, and the notching of the bars and inconveniences resulting therefrom are avoided. With this construction,

moreover, the bars can be attached to the roll at a number of points, instead of at the ends only, permitting the use of a longer beater-roll and wholly obviating the springing out of the bars at the center.

In the old construction when from any cause one of the bars became defective it could only be replaced by taking to pieces the entire roll and shrinking on a new hoop. With my construction defective bars can readily be replaced by new ones. The old bars had to be made Sufficiently wide (a term used herein to designate the dimension of the bar in the direction from the center to the circumference of the roll) to allow for the application of the holding ring or hoop. By my invention the width of the bars can be reduced about one-third. As the bars are set radially with respect to the rolls, the width of the bars in a roll of given diameter limits the number that can be used, and hence by reducing the width of the bar it is possible to increase their number, and thereby increase the efficiency of the roll.

In the accompanying drawings, which form a part of this specification, Figure I is a partial section transverse to the axis of the roll, and Fig. II a partial section lengthwise of the roll.

A represents the outer part of one of'the iron disks or plates fixed concentrically on the shaft of the roll. It has a circular flange, a,

cast in one piece therewith, through which at.

regular intervals are drilled holes forthe bolts B. The roll-bars O, of steel, are tapering in cross section, as shown in Fig. I, and their broad edges rest upon the edge of plate A and also on the flange a. They are disposed at regular intervals around plate A, and between each two bars is placed a wedge-shaped key, D, of iron, cast with a central hole for the bolts B. TheboltsBpassupwardthroughtheflange a and through keys D, and the parts are clamped together by nuts E. The keys are preferably so formed that they'will not quite touch the flange a on being screwed in place, sufficient allowance being made for wedging the keys in farther when it becomes necessary to tighten the bars.

As shown, the edge of the plate A projects slightly beyond the flange a, forming a shoulder, and the ends of the bars 0 are correspondingly notched,the object being to prevent endplay of the bars. The notch could as well be made in the middle of the bar where it is attoo taehed to one of the intermediate disks, A. Vhen the bars are bent at the middle, the notch at that point would facilitate bending.

To put the parts together the bars are placed in the proper position on the disks A and the keys and bolts loosely inserted. The nuts are then tightened one by one until the parts are all firmly clamped together.

It will be seen that the keys D bear for their entire length against the sides of the bars, and this may be, as shown, about half the width of the latter, so that there is no undue strain on any part of the bar,whieh has heretofore been the occasion of frequent breakage, and the bars are braced or supported niuch nearer their operating edges than heretofore.

The heads of bolts 13 are placed so close to the side of plate A as to prevent their turn ing around.

The spaces between the blades 0 may be filled with strips of Wood or other material, as is commonly done, to prevent the material operated upon from passing between the blades to the inside of the roll.

I claim- 25 1. In abeater-roll for pnlpengines, the combination, with the disks or plates having circular flanges, of the roll-bars resting on said flanges and the wedge-shaped keys interposed between the bars and bolted to said flanges, 30 substantially as described.

2. In a beater-roller, the combination of the supporting-disks provided with flanges, the disks projecting beyond said flanges forming shoulders, the roll-bars notched to fit said 35 shoulders,whereby end-play of the bars is prevented, the wedgeshaped keys interposed between the bars, and the fastening-bolts, substantially as described.

In testimony whereof I have signed this 0 specification in the presence of two subscribing witnesses.

JOHN I-IOYT.

Witnesses:

PHILIP MAURO, C. J. HEDRICK. 

